Gas-tight seal.



K. MENSINGR GAS TIGHT SEAL.

APPLICATION FILED OCT. 30, 1913.

1 141 1 33 Patented June 1, 1915.

\Wtnesses: inventor:

9 I Karl Mensing,

' DH e jwm W His o ttor-neg.

UNITED STATES PATENT OFFICE.

KARL MENSING, OF HANAU, GERMANY, ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

GAS-TIGHT SEAL.

The present invention comprises a gastight seal for envelops in which for any reason a seal made by fusion is not practicable. For example, in the utilization of silica for electrical apparatus, mechanically fitted leading-in conductors are commonly em loyed, because of the high fusing point an low thermal expansion coefiicient of silica. In order to maintain such seals perfectly gas-tight, ante-chambers filled with mercury have been placedaround the exterior of the closure, but suchfseals' are still accompanied by the disadvantage that tilt ing or inverting the device is apt to bring into direct contact withthe mechanical seal a bubble of gas which in course of time accumulates in the ante-chamber, andthus permits gas to penetrate into the main container.

In accordance with m invention I provide an ante-chamber fi led. with mercury, or other sealing liquid, the chamber being so constructed and the seal being so located therein, that a space or pocket is provided above the exposed end of the seal in any position of the device, so that a gas bubble will rise above the exposed end of seal and in no case comes in contact with the closure even when the device is inverted.

My invention will be pointed out with greater particularity in the appended claims.

In the accompanying drawing, Figure 1 is a sectional view illustrating somewhat diagrammatically my novel construction; Figs. 2 and 3 illustrate the same construction in different positions; and Fig. 4 illustrates a modification.

Referring to Fig. 1 the main envelop 1 may consist, for example, of material such as fused quartz as commonly used for vapor electric devices. All the parts of the vapor electric device itself have not been shown as these are well understood in the art and form no part of the present invention. Into the 'mouth or nipple part 9 of the receptacle is fitted or embedded a plug 2 consisting of material having practically the same coeifi- Specification of Letters Patent.

Application filed October 30, 1913. Serial No. 798,248.

cient of expansion as the wall. For example, in the case of a quartz receptacle the plug may consistof nickelsteel. .This plug may be taperedfasshown in the drawing. Adjoining the plug 2 is a receptacle 3 which constitutes an ante;ch'amber and which con. tains a quantity of mercu or other heavy liquid 4, for the purpose 0 sealing the joint between the plu 2 and the wall of the en-, velop 1. As ind icated, this chamber is provided with an annular pocket 5 surrounding but out of immediate contact with the plug 2. The receptacle 3 is provided with an ex terior closure or plug 6 also of nickel steel. The walls of the chamber 3 are preferably bulged outwardly, as indicated. It will be observed that this construction locates the exposed joint between the plug 2 and the inverted space is provided for the gas by the annular pocket 5, as shown in Fig. 3, so that in all cases the joint between the inner plug 2 and the projecting mouth 9 of the device is covered by sealing liquid.

In the construction shown in Fig. 4 the closures 7 and 8 are screw-threaded into the wall 1, and any other means of making a joint mechanically-as tight as possible may be used. In fact, in some cases this construction will be found to be useful where the materials constituting the walls of the vessels are fused about the leading-in conductor and for any reason a vacuum or gastight seal cannot be obtained by this method alone. For example, when the chemical nature of either the wall or the sealing-in material is such that proper adhesion does not take place between the two. Not only may such seals be used to advantage in vessels consisting of refractory material such as quartz, but also metal such as iron in which mechanically fitted seals are necessary.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. The combination of an envelop having a projecting mouth, a mechanically fitted closure therefor, a receptacle surrounding and the amount of the sealing liqc cl being adapted to cover with scicl ll-fjlllfil the joint between the wells of the envelop and tie mechanically fitted. closure in c l LQS'ltlQilS of. said envelop zinoi an external cleeiire for said receptacle.

2. In an electrical apparetus, envelop having a projecting; month, a fittei'i oleetr'i-- cally conducting closure therefor, z tecle surrounding said closure, at conducting liquid partly filling said receptacle sullieient in amount to cover the joint between seicl closure and the adjacent Well of the envelop in all positions of the apparatus, and. an external conducting closure for seitl tacle.

3. In an electrical apparatus, en G'v'2lCl1 atecl envelop, and CUITBHE'COEH means therefor comprising it solid reactor embedded in an outvrerdl} projecting section. of said; envelop, a receptacle surrounding said projecting section and an i cl conductor, said receptacle having; it pocket adjoining weer 1t em "oportionecl to cover the joint beconductor find the adjacent Well. positions of said envelop, encl conducting closer-re for seirl receptacle.

the combination of e ,ges-tigh" envelop, e, mecha.nicelli, fitted c oeure in the Well off? said envelop, a receptacle surrounding the external end of said closure, e horlv of" me cury in said receptacle, the end of suiel clesure projecting with a, surrounding well into seicl receptacle so that it Will he mereccl in iz'iercury even when inverted, emit an external closuze for said receptacle. 2&0

lin Witness whereof, have hereunto my hand this 17th day of July, 1913. 

